For it is written in the Law of Moses: 'You must not muzzle an ox to keep it from eating as it treads out the grain.'
Paul is defending his rights as an apostle, using the Law of Moses to illustrate that those who work in ministry have the right to receive material support.
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Fulfilled in1 Timothy 5:18
Paul reiterates this principle in his letter to Timothy, applying it to the support of church leaders, showing the ongoing application of this Old Testament law in the New Testament church.
This prophecy underscores the principle of just compensation for labor, which is a reflection of God's justice and care for His workers. It also illustrates the continuity between Old Testament law and New Testament practice.